EP2899824B1 - Dispositif de prévention contre les surtensions et circuit de redressement de courant - Google Patents

Dispositif de prévention contre les surtensions et circuit de redressement de courant Download PDF

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Publication number
EP2899824B1
EP2899824B1 EP15152466.7A EP15152466A EP2899824B1 EP 2899824 B1 EP2899824 B1 EP 2899824B1 EP 15152466 A EP15152466 A EP 15152466A EP 2899824 B1 EP2899824 B1 EP 2899824B1
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EP
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Prior art keywords
short
circuit
circuit device
frequency converter
voltage
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EP15152466.7A
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German (de)
English (en)
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EP2899824A1 (fr
Inventor
Ryuta Hasegawa
Teruyuki Ishizuki
Takashi Fujita
Takahisa Kageyama
Yutaro Kitamori
Sho Sato
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Toshiba Corp
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Toshiba Corp
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
    • H02P6/005—Arrangements for controlling doubly fed motors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/06—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric generators; for synchronous capacitors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/02—Providing protection against overload without automatic interruption of supply
    • H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/02—Providing protection against overload without automatic interruption of supply
    • H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
    • H02P29/0241—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the fault being an overvoltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/007—Control circuits for doubly fed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/001—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection limiting speed of change of electric quantities, e.g. soft switching on or off
    • H02H9/002—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection limiting speed of change of electric quantities, e.g. soft switching on or off limiting inrush current on switching on of inductive loads subjected to remanence, e.g. transformers

Definitions

  • Embodiments described herein relate generally to an over-voltage prevention device which protects a frequency converter or a secondary winding of a wound-rotor induction machine from an over-voltage, and a current rectifying circuit provided in the over-voltage prevention device.
  • WO 03 065567 A1 relates to a circuit with a variable rotational speed to be used particularly in a wind power plant, comprising a double fed asynchronous generator, a crow-bar, an additional resistor and a converter.
  • the additional resistor can be regulated with the aid of a fast switch in such a way that the converter can be provisionally disconnected at least partly in case of a short circuit in the network.
  • the rotor current is momentarily assumed by the additional resistor and disconnected after the rotor short circuit current dies out so that the converter can be subsequently connected once again and so that it can supply the desired active short circuit current to the network.
  • JP S 54150626 A relates to a prevention of the destruction of device by taking measures to meet an instantaneous power cut-off and an instantaneous phase lack separately.
  • the wound-rotor type induction motor is connected to the Graetz rectifier circuit and the inverter circuit.
  • the gate of inverter is turned down by a signal.
  • the secondary side of motor is shorted with the resistance by giving a signal to the thyristor in order to prevent the destruction of semiconductor by a transient high voltage.
  • the motor speed is less than the minimum speed of the Scherbius control range, the breaker is opened by a command, a high resistance is inserted in the secondary side of motor to perform a resistance starting.
  • an instantaneous phase lack is produced, the power breaker is turned off, the thyristor is turned on, the gate of inverter SCR is turned down by signals respectively, and an OFF command is provided to the breaker at the same time.
  • WO 2015/092553 relates to a circuit with a variable rotational speed to be used particularly in a wind power plant, comprising a double fed asynchronous generator, a crow-bar, an additional resistor and a converter.
  • the additional resistor can be regulated with the aid of a fast switch in such a way that the converter can be provisionally disconnected at least partly in case of a short circuit in the network.
  • the rotor current is momentarily assumed by the additional resistor and disconnected after the rotor short circuit current dies out so that the converter can be subsequently connected once again and so that it can supply the desired active short circuit current to the network.
  • FIG. 4 shows an example of a circuit structure including a secondary over-voltage prevention device of the conventional wound-rotor induction machines.
  • a primary winding terminal of a wound-rotor induction machine 1 is connected to an electric power system 3 through a main transformer 2 and a power transmission line 4.
  • a voltage of the primary winding terminal of a wound-rotor induction machine 1 is converted to a voltage equivalent to that of the electric power system 3 at the main transformer 2, and then supplied to the electric power system 3 through the power transmission line 4.
  • the secondary winding terminal of the wound-rotor induction machine 1 is connected, through a first short-circuit device 12, to a frequency converter 7 comprising, for example, a self-excited converter 5/inverter 6 connected to the main transformer 2.
  • a three-phase AC voltage is converted to a DC voltage by the converter 5, and the DC voltage is stored at the DC link capacitor 8.
  • the DC voltage is then converted to a three-phase AC voltage corresponding to a slip frequency of the wound-rotor induction machine 1 by the inverter 6.
  • the frequency converter 7 excites the secondary side of the wound-rotor induction machine 1 by the three-phase AC voltage.
  • the frequency converter 7 comprises a chopper 11 including a resistor 9 and a power semiconductor element 10 (e.g., GTO or IGBT) to protect an element forming the converter 5 or the inverter 6 from an over-voltage due to an increase of DC link voltage.
  • a first short-circuit device 12 is provided between the frequency converter 7 and the secondary winding terminal of the wound-rotor induction machine 1.
  • the first short-circuit device 12 has a function of short-circuiting between phases of three-phase AC currents when an over-voltage is produced at the secondary side of the wound-rotor induction machine 1.
  • the chopper 11 and the short-circuit device 12 are activated at the time t2.
  • the chopper 11 is activated first, and if the over-voltage is not eliminated after a predetermined time has elapsed, the first short-circuit device 12 is activated; however, the illustration is simplified so that the overall operation may be easily understood.
  • the first short-circuit device 12 performs three-phase short-circuiting to the secondary winding of the wound-rotor induction machine 1 and the output-side of the frequency converter 7.
  • a short-circuit current flows between phases in the secondary side of the wound-rotor induction machine 1 through the first short-circuit device 12, and the short-circuit current decays in accordance with the time constant of the secondary winding of the wound-rotor induction machine 1.
  • the short-circuiting of the first short-circuit device 12 is terminated at the time t3 in consideration of the time when the failure in the electric power system 3 or the power transmission line 4 is eliminated. Since the first short-circuit device 12 is formed of a thyristor with high current tolerance, the first short-circuit device 12 cannot be turned off unless the short-circuit current becomes zero. The frequency converter 7 is restarted to apply a voltage in the direction opposite to the short-circuit current flowing through the first short-circuit device 12 so that the current flowing through the first short-circuit device 12 becomes zero.
  • FIG. 1 illustrates an example of a configuration of a circuit including a secondary over-voltage prevention device of the wound-rotor induction machine 1 according to the first embodiment.
  • the same reference numerals as in FIG. 4 denote the same elements.
  • a primary winding terminal of the wound-rotor induction machine 1 is connected to the electric power system 3 through the main transformer 2 and the power transmission line 4.
  • a voltage of the primary winding terminal of the wound-rotor induction machine 1 is converted to a voltage equivalent to that of the electric power system 3 at the main transformer 2, and then supplied to the electric power system 3 through the power transmission line 4.
  • the secondary winding terminal of the wound-rotor induction machine 1 is connected, through a first short-circuit device 12 and a current rectifying circuit 15, to a frequency converter 7 comprising, for example, a self-excited converter 5/inverter 6 connected to the main transformer 2.
  • a three-phase AC voltage is converted to a DC voltage by the converter 5, and the DC voltage is stored at the DC link capacitor 8.
  • the DC voltage is then converted to a three-phase AC voltage corresponding to a slip frequency of the wound-rotor induction machine 1 by the inverter 6.
  • the frequency converter 7 excites the secondary side of the wound-rotor induction machine 1 by the three-phase AC voltage.
  • the frequency converter 7 comprises a chopper 11 including a resistor 9 and a power semiconductor element 10 (e.g., GTO or IGBT) to protect an element forming the converter 5 or the inverter 6 from an over-voltage due to a DC link voltage increase.
  • the first short-circuit device 12 and the current rectifying circuit 15 are provided between the frequency converter 7 and the secondary winding terminal of the wound-rotor induction machine 1 in this embodiment.
  • the first short-circuit device 12 has a function of short-circuiting between phases of three-phase AC currents when an over-voltage is produced at the secondary side of the wound-rotor induction machine 1.
  • the current rectifying circuit 15 comprises resistors 13 each connected between the first short-circuit device 12 and the frequency converter 7 for each phase and second short-circuit devices 14 connected respectively to the resistors 13 in parallel.
  • the second short-circuit device 14 has a function of short-circuiting between the frequency converter 7 and the secondary side of the wound-rotor induction machine 1.
  • the second short-circuit device 14 is formed of a plurality of mechanic breakers connected in parallel, as shown in FIG. 1 .
  • a controller 100 controls the secondary side of the wound-rotor induction machine 1.
  • a part of the controller 100 forms the secondary over-voltage prevention device together with the first short-circuit device 12 and the current rectifying circuit 15.
  • the controller 100 obtains a measured value of voltage at the DC link capacitor 8 (capacitor voltage), a measured value of current flowing from the frequency converter 7 (converter current) and a measured value of current flowing through the first short-circuit device 12 (first short-circuit device current) through various sensors placed at particular spots, and drives each element included in the converter 5/inverter 6, the first short-circuit device 12, and the second short-circuit devices 14, based on the obtained measured values.
  • the controller 100 controls the first short-circuit device 12 to perform short-circuiting, stops the frequency converter 7, and cancels short-circuiting of the second short-circuit devices 14. After the failure is eliminated, the controller 100 restarts the frequency converter 7 to set the current flowing through the first short-circuit device 12 to be zero, cancels short-circuiting of the first short-circuit device 12, and then controls the second short-circuit devices 14 to perform short-circuiting after a predetermined time has elapsed.
  • the resistance of the resistor 13 is a value ensuring that the capacitor voltage at a time when the short-circuit current flows into the frequency converter 7 from the first short-circuit device 12 due to restart of the frequency converter 7 is below an operational threshold of the first short-circuit device 12.
  • the resistance of the resistor 13 is smaller than a value obtained by dividing the maximum output voltage of the frequency converter 7 by the estimated maximum current when flowing from the first short-circuit device 12 into the frequency converter 7.
  • a low-cost mechanical breaker or a disconnector without a current blocking function may be utilized instead of the breaker. Otherwise, a plurality of mechanical breakers connected in parallel may be used as the second short-circuit devices 14. In the configuration where a plurality of breakers are used, even if one of the breakers is erroneously opened during normal operation, a current flows into the parallel breakers. Accordingly, continuous operation or safe operation can be realized without producing an arc.
  • the interval between time t1 and time t2 is about 10 msec
  • the interval between time t2 and time t3 is about 70 msec
  • the interval between time t2 and time t4 is about 200 msec.
  • the chopper 11 and the first short-circuit device 12 are activated.
  • the chopper 11 is activated first, and if the over-voltage is not overcome after a predetermined time has elapsed, the first short-circuit device 12 is activated; however, the illustration is simplified so that the overall operation may be easily understood.
  • the first short-circuit device 12 performs three-phase short-circuiting to the secondary winding of the wound-rotor induction machine 1 and the output-side of the frequency converter 7.
  • the short-circuiting of the first short-circuit device 12 is canceled at the time t3. Since the first short-circuit device 12 is formed of a thyristor, it is not possible to cause the current to be zero even by switching a gate signal off. Accordingly, when a short-circuit canceling signal is sent to the first short-circuit device 12, the frequency converter 7 is driven, and an inverse voltage is applied to the thyristor. As a result, the short-circuit current flows from the first short-circuit device 12 to the frequency converter 7 through the resistor 13.
  • the second short-circuit device 14 is controlled to execute short-circuiting to return to the normal operation.
  • the first embodiment after a failure in the electric power system, short-circuiting of the first short-circuit device 12 is canceled, and a short-circuit current flows into the frequency converter 7 through the resistor 13, thereby reducing the current to flow into the frequency converter 7, and suppressing increase of the DC link voltage. Since the capacitor voltage at a time when flowing into the frequency converter 7 does not reach an operational threshold, the first short-circuit device 12 is not reactivated. In addition, the system can be recovered from the failure in a short time without depending on a time constant or an operation condition of the secondary winding of the wound-rotor induction machine 1.
  • the second embodiment will be explained with reference to FIG. 3 together with FIGS. 1 and 2 .
  • the same reference numerals as in the first embodiment denote the same elements, a detailed explanation thereof will be omitted, and different portions will mainly be described.
  • a semiconductor breaker is utilized for the second short-circuit device 14, instead of the mechanical breaker, as shown in FIG. 3 .
  • the semiconductor breaker is configured of a power semiconductor element such as an IGBT or a GTO and a diode connected in anti-parallel. An AC current continuously flows by connecting them in anti-series.
  • the current amount and the number of parallel connections are determined by a current flowing through the semiconductor in normal operation.
  • the number of series connections and the withstand voltage of the semiconductor breaker are determined based on voltage decrease when a short-circuit current flows through the resistor 13.
  • the number of parallel connections or series connections may increase in consideration of the case where a failure occurs in the semiconductor breaker.
  • the timings of activating and inactivating the second short-circuit device are the same as those explained in the first embodiment.
  • the second embodiment it is possible to realize high-speed short-circuiting and canceling operations by utilizing the semiconductor breaker as the second short-circuit device. This allows the system to recover from a failure in a short time when a failure occurs continuously in a short time period. In addition, it is possible to reduce the interval between t3 to t5 during which a current flows into the resistor 13, thereby reducing the capacity of the resistor.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Ac Motors In General (AREA)
  • Protection Of Static Devices (AREA)
  • Control Of Electric Motors In General (AREA)
  • Control Of Eletrric Generators (AREA)

Claims (14)

  1. Circuit applicable à un dispositif qui inclut un convertisseur de fréquence (7) configuré pour exciter un côté secondaire d'une machine à induction à rotor bobiné (1) par un courant alternatif triphasé, et un premier dispositif de court-circuit (12) prévu entre le côté secondaire de la machine à induction à rotor bobiné (1) et le convertisseur de fréquence (7), le premier dispositif de court-circuit (12) présentant une fonction de court-circuitage entre des phases du courant alternatif triphasé, le circuit étant caractérisé en ce qu'il comprend :
    des résistors (13) pouvant chacun être connectés entre le premier dispositif de court-circuit (12) et le convertisseur de fréquence (7) pour chaque phase ;
    des seconds dispositifs de court-circuit (14) connectés respectivement aux résistors (13) en parallèle et présentant une fonction de court-circuitage entre le convertisseur de fréquence (7) et le côté secondaire de la machine à induction à rotor bobiné (1) ; et
    un dispositif de commande (100) i) configuré pour, en réponse à une détection d'une surtension au niveau du côté secondaire de la machine à induction à rotor bobiné, activer le premier dispositif de court-circuit (12) pour effectuer un court-circuitage, désactiver le convertisseur de fréquence (7), et annuler un court-circuitage des seconds dispositifs de court-circuit (14), à un premier point temporel, ii) configuré pour redémarrer le convertisseur de fréquence (7) pour régler le courant circulant à travers le premier dispositif de court-circuit (12) à zéro, et annuler un court-circuitage du premier dispositif de court-circuit (12), à un deuxième point temporel après qu'une période de temps prédéterminée se soit écoulée depuis le premier point temporel et iii) configuré pour commander les seconds dispositifs de court-circuit (14) pour effectuer un court-circuitage, à un troisième point temporel après qu'une période de temps prédéterminée se soit écoulée depuis le premier point temporel, dans lequel le troisième point temporel vient après le deuxième point temporel,
    ledit circuit pouvant être commandé de telle sorte qu'un courant de court-circuit circule à partir du premier dispositif de court-circuit (12) à travers les résistors (13) jusque dans le convertisseur de fréquence (7) lorsqu'un court-circuitage du premier dispositif de court-circuit (12) est annulé.
  2. Circuit selon la revendication 1, caractérisé en ce qu'une résistance du résistor (13) est inférieure à une valeur obtenue en divisant une tension de sortie maximale du convertisseur de fréquence (7) par un courant maximal lors d'une circulation à partir du premier dispositif de court-circuit (12) à travers le résistor (13) jusque dans le convertisseur de fréquence (7).
  3. Circuit selon la revendication 1 ou 2, caractérisé en ce qu'une résistance du résistor (13) est une valeur garantissant qu'une tension d'un condensateur de liaison CC (8) prévu dans le convertisseur de fréquence (7) à un moment où un courant de court-circuit circule dans le convertisseur de fréquence (7) à partir du premier dispositif de court-circuit (12) en raison d'un redémarrage du convertisseur de fréquence (7) est inférieure à un seuil opérationnel du premier dispositif de court-circuit (12).
  4. Circuit selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le second dispositif de court-circuit (14) est formé d'un disjoncteur mécanique.
  5. Circuit selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le second dispositif de court-circuit (14) est formé d'une pluralité de disjoncteurs mécaniques connectés en parallèle.
  6. Circuit selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le second dispositif de court-circuit (14) est formé d'un disjoncteur à semi-conducteur.
  7. Circuit selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le second dispositif de court-circuit (14) est formé d'une pluralité de disjoncteurs à semi-conducteur connectés en parallèle.
  8. Dispositif anti-surtension comprenant un circuit selon la revendication 1, et
    le premier dispositif de court-circuit (12) pouvant être prévu entre le côté secondaire de la machine à induction à rotor bobiné (1) et le convertisseur de fréquence (7) configuré pour exciter le côté secondaire par le courant alternatif triphasé, le premier dispositif de court-circuit (12) présentant une fonction de court-circuitage entre des phases du courant alternatif triphasé,
    ledit dispositif anti-surtension pouvant être commandé de telle sorte qu'un courant de court-circuit circule à partir du premier dispositif de court-circuit (12) à travers les résistors (13) jusque dans le convertisseur de fréquence (7) lorsqu'un court-circuitage du premier dispositif de court-circuit (12) est annulé.
  9. Dispositif anti-surtension selon la revendication 8, caractérisé en ce qu'une résistance du résistor (13) est inférieure à une valeur obtenue en divisant une tension de sortie maximale du convertisseur de fréquence (7) par un courant maximal lors d'une circulation à partir du premier dispositif de court-circuit (12) à travers le résistor (13) jusque dans le convertisseur de fréquence (7).
  10. Dispositif anti-surtension selon l'une quelconque des revendications 8 et 9, caractérisé en ce qu'une résistance du résistor (13) est une valeur garantissant qu'une tension d'un condensateur de liaison CC (8) prévu dans le convertisseur de fréquence (7) à un moment où un courant de court-circuit circule dans le convertisseur de fréquence (7) à partir du premier dispositif de court-circuit (12) en raison d'un redémarrage du convertisseur de fréquence (7) est inférieure à un seuil opérationnel du premier dispositif de court-circuit (12).
  11. Dispositif anti-surtension selon l'une quelconque des revendications 8 à 10, caractérisé en ce que le second dispositif de court-circuit (14) est formé d'un disjoncteur mécanique.
  12. Dispositif anti-surtension selon l'une quelconque des revendications 8 à 10, caractérisé en ce que le second dispositif de court-circuit (14) est formé d'une pluralité de disjoncteurs mécaniques connectés en parallèle.
  13. Dispositif anti-surtension selon l'une quelconque des revendications 8 à 10, caractérisé en ce que le second dispositif de court-circuit (14) est formé d'un disjoncteur à semi-conducteur.
  14. Dispositif anti-surtension selon l'une quelconque des revendications 8 à 10, caractérisé en ce que le second dispositif de court-circuit (14) est formé d'une pluralité de disjoncteurs à semi-conducteur connectés en parallèle.
EP15152466.7A 2014-01-27 2015-01-26 Dispositif de prévention contre les surtensions et circuit de redressement de courant Active EP2899824B1 (fr)

Applications Claiming Priority (1)

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JP2014012825A JP6071912B2 (ja) 2014-01-27 2014-01-27 過電圧保護装置および電流調整回路

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EP2899824A1 EP2899824A1 (fr) 2015-07-29
EP2899824B1 true EP2899824B1 (fr) 2021-08-18

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EP2923441B1 (fr) * 2012-11-20 2019-01-09 Vestas Wind Systems A/S Procédés et systèmes pour réduire l'impact d'un court-circuit de générateur dans une turbine éolienne
US10193322B2 (en) * 2015-11-13 2019-01-29 Silicon Power Corporation Low-loss and fast acting solid-state breaker
JP6640635B2 (ja) * 2016-03-28 2020-02-05 株式会社東芝 可変速揚水発電システムの過電圧保護装置
JP6730113B2 (ja) * 2016-07-05 2020-07-29 株式会社東芝 制御装置および可変速発電電動機始動方法
WO2018096930A1 (fr) * 2016-11-25 2018-05-31 株式会社 東芝 Dispositif de protection contre les surtensions d'un système de génération d'énergie à vitesse variable
JP6725446B2 (ja) * 2017-03-23 2020-07-15 株式会社東芝 巻線形誘導機の制御システム、および制御方法
JP6371021B1 (ja) * 2017-03-24 2018-08-08 株式会社東芝 可変速揚水発電システムおよび可変速揚水発電方法
US20200158075A1 (en) * 2017-04-13 2020-05-21 Voith Patent Gmbh Hydropower plant for controlling grid frequency and method of operating same
CN110277764B (zh) * 2019-07-24 2022-04-08 阳光电源股份有限公司 一种电网过压保护电路和方法
JP6848041B2 (ja) * 2019-12-24 2021-03-24 株式会社東芝 可変速揚水発電システムの過電圧保護装置

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WO2015092553A2 (fr) * 2013-12-18 2015-06-25 Ingeteam Power Technology, S.A. Dispositif à impédance variable pour une turbine éolienne

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EP2899824A1 (fr) 2015-07-29
US20150214870A1 (en) 2015-07-30
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JP2015142398A (ja) 2015-08-03
CN104810799B (zh) 2018-03-13
US9548685B2 (en) 2017-01-17

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